参数资料
型号: WJLXT972ALC.A4
厂商: INTEL CORP
元件分类: 网络接口
英文描述: DATACOM, ETHERNET TRANSCEIVER, PQFP64
封装: ROHS COMPLIANT, LQFP-64
文件页数: 52/97页
文件大小: 1281K
代理商: WJLXT972ALC.A4
Intel
LXT972A Single-Port 10/100 Mbps PHY Transceiver
56
Datasheet
Document Number: 249186-004
Revision Date: 25-Oct-2005
5.9.4
LED Pulse Stretching
The LED Configuration Register also provides optional LED pulse stretching to 30, 60, or 100 ms.
The pulse stretch time is extended further if the event occurs again during this pulse stretch period.
When an event such as receiving a packet occurs, the event is edge detected and it starts the stretch
timer. The LED driver remains asserted until the stretch timer expires. If another event occurs
before the stretch timer expires, then the stretch timer is reset and the stretch time is extended.
When a long event (such as duplex status) occurs, the event is edge detected and it starts the stretch
timer. When the stretch timer expires, the edge detector is reset so that a long event causes another
pulse to be generated from the edge detector, which resets the stretch timer and causes the LED
driver to remain asserted.
Figure 19 shows how the stretch operation functions.
Figure 19. LED Pulse Stretching
Event
LED
Note: The direct drive LED outputs in this diagram are shown as active L ow.
stretch
B3475-01
相关PDF资料
PDF描述
WJLXT972ALC.A4 DATACOM, ETHERNET TRANSCEIVER, PQFP64
WJLXT972MLC.A4-864101 DATACOM, ETHERNET TRANSCEIVER, PQFP48
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